.I've read in more than one place, one of which was in Max Pemberton's column in the Daily Telegraph, that in some cases paracetamol can make quite a dramatic difference in old people's symptoms of confusion.
There have been a few times when my father (92, early-ish vascular dementia) has perked up quite remarkably when he's had two 500mg tablets. On the most remarkable occasion, there was also a bit of caffeine added (it was late on a Sunday afternoon, and only the garage was open, and branded Panadol Plus was all I could buy).
By the time the out-of-hours doctor arrived the confusion and immobility I'd described had almost gone. He was found to have had a UTI. At that time he was only significantly confused when he had a chest or water infection.
Do other posters here have any experience of this?